I understand but my point was that the timer and candle have nothing in common. To your point would it OK to hire someone for Shabbat to turn on/off your electric appliances? I work cheap.
The difference between you and a timer is that you are intelligent (to some degree) and we are also not allowed to have someone do it FOR us. The timer is dumb and doesn't do anything FOR any reason, it just does what it was set up to do.
That being said, under certain circumstances it may be allowed but those are some of the more complex laws of Shabbat.